WASHINGTON -- The U.S. Supreme Court on Monday struck down Montana's century-old limits on corporate political spending, putting an end to the state's resistance to Citizens United and effectively expanding that controversial ruling to the state and local elections. Citizens United v. Federal Election Commission, decided in January 2010, struck down federal limits on campaign spending by corporations and unions as violations of the First Amendment. Justice Anthony Kennedy, writing on behalf of Chief Justice John Roberts and Justices Antonin Scalia, Clarence Thomas and Samuel Alito, reached the bold conclusion that "independent expenditures, including those made by corporations...